Saw



March 22, 1932. A, o. SCHAEFER SAW Original Filed Nov.

Inueni'o e er,

Adolph 0.50 B Qi,

3 fly.

Patented Mar. 22, 1932 UNITED STATES PATENT ()FFICE ADOLPH O. SGHAEFER,OF BROOKLYN, NEW YORK, ASSIGNOR T0 ATLANTIC SERVICE COMPANY, INC., OFBROOKLYN, NEW YORK, A CORPORATION OF NEW YORK SAW Original appIicationfiled November 6, 1930, Serial No; 493,860. Divided and this applicationfiled June Y My invention relates to new and useful improvements insaws, and more particularly to a saw which is to be used in the meatin-Hus r suc as or on i =6 d t y, h f tt n inimal carcasses The presentapplication 18 a divlsion of an {application filed by me on the 6th dayof November, 1930, Serial Number 493,860, for :saws and the method ofmaking the same.

' x0116 of the principal objects of the invenno matter how often the sawis sharpened.

As is well known to those skilled in the art, saws have been providedwith a wave line in their teeth, but many difficulties are encounteredwhen the saw is to be refiled and resharpened, as there is no practicalmeans for guiding the saw through a filing machine which will cause therefiling action to accurately follow the original wave line of the saw.

A further object of the invention is to provide a wave line in the teethand to provide a similar form of wave line on the rear edge of the saw,so that after the saw is made and 'sent back for reliling, the rear edgeof the same acts as a standard or gauge and the refiling will beduplicated on each toothed edge and this will happen no matter how oftenthe bladeis re-filed.

Still another object of the invention is to provide a saw of the narrowband type which may be cut from stock in any desired lengths and whereinas the saw is being initially made, the ribbon or stock may be passedthrough a machine, which 1 will accurately form the gauge or wave lineonthe back, and thiswave line will also act as a true guide for thestamping or cutting of the teetn and for the filing of the teeth.

Still another object of the invention is to utilize a roll of thin metalribbon stock which is formed with the wave or gauge on its rear surfaceand with a corresponding wave or pitch line for the teeth, this beingcarried out for the length of the ribbon. The ribbon stock thus formedmay then be cut off into any desired lengths to thus provide saws SerialNo. 545,314.

which may be again accurately sharpened and refiled when necessary.

With these and other objects in view, the invention consists in certainnew and novel arrangements and combination of parts, as will behereinafter more fully explained and pointed out in the claims.

Referring now to the drawings showing a preferred embodiment,

Fig. l is a view of the raw stock;

Fig. 2 is a diagrammatic view showing the ribbon of stock as having awave line or guide formed in its rear surface;

Fig. 3 is a view similar to Fig. 2 and showing diagrammatically themeans for advancing and grinding the wave line in the rear of the ribbonstock;

Fig. 4 is a fragmentary view of the ribbon stock showing the teeth beingpunched therein;

Fig. 5 is a fragmentary view showing the setting of the teeth;

Fig. 6 is a fragmentary view showing the teeth being filed;

Fig. 7 is a view of a piece of the ribbon cut into the desired sawlengths.

Referring now more particularly to the drawings, there is shown in 1 aroll 1 of the thin metal ribbon stock 2 out of which the saws are to bemade. This ribbon is then fed on a drum, diagrammatically shown at 3,and is ground withthe wave or gauge 4 by a grinding wheel 5 alsodiagrammatically shown.

The depth of the wave, that is, the distance from the crest to thebottom of the valley, is preferably substantially sixteen-thousandths ofan inch (.016).

amount between each contact of the grinding 9 wheel with the rear edgeof the ribbon.

As diagrammatically shown in Fig. 4,, a roller 6 is used to correctlyposition the stock Qon a die 7, so that the punch 8 may form the teeth 9in a wave-line corresponding exactly toothed edge as that of the waveonthe back Or upper edge of the ribbon and that the valley in the rearedge is exactly opposite the crest in the toothed edge, whichtheoretically creates two wave lines, which are equi-distant apart atevery point.

It will also beunderstood that the size of theteeth may be nine to aninch, ten to an inch and twelve to an inch, the linear pitch of the waveremaining the same independent of the size of the teeth. In other words,if the size of the teeth were diminished until they became so small thatthey could not be seen, the toothed edge would finally resolve itselfinto a waved line, exactly like the back edge of the blade. In Fig.5,there is diagrammaticallyshown one manner of passing the saw through thesetting hammer and anvil, although it is to be understood that a rollersimilar to the roller 6 might be used. The spirals 12 actas heightgauges and guide the saw in relation to the anvil by means ofthe wavedteeth. However, it is to be understood that the wave back is the gaugeand the feed of the blade may be accomplished by a pawl or spiral or in,any

7 other manner.

' I have also shown fragmentarily in Fig. 6 a 7 part of the stock 2 withits wave line 4 acting as a gauge for the filing of the teethwhen I thesaw is being constructed, the file 13 being diagrammatically shown.stood that after the saw is so formed, it may be cut in any desiredlengths 11, as shown in Fig. 7. Holes '10 may be formed at the oppositeends of the saw. 1 r

i The pitch or wave which I have found to be most desirable isthree-quarters of an inch or, in other words, three-quarters of an inchfrom crestto crest- Thus, four feet of steel stoc'lror ribbon wouldcontain exactly six'tyfour waves. I

. It will be understood that the measure ments set out for the wavedepth are the ones that have' so far given the most satisfactoryserv1ce,;but'I do not wish to limited to theexact fractional partstated, as a depth 7 slightly greateror slightly less might prove justas effective. 7 There are a good many advantages in formmg the ribbonstock in the manner above described, as any desired length of saw may becut from the ribbon. It will also be seen that by forming the true guideor wave line in the It will be'un'den' .thus always remain during thelife of the saw.

Finally, it will be seen that there is no increase in file pressure atthe high point in the toothed wave, which has been a diflicultyencountered when filing wave-like teeth in the saw of conventionaldesign. I

' I am aware that it is old to form a saw blade with a reversing swellbetween the ends and the middle of the sawing edge, but I am not'awareof a saw cut from long ribbon stock which has been formed with a waveline or gauge 011 its rear edge, which gauge is used in the stamping ofthe teeth, the setting, filin and refiling of the same, and wherein theteet are formed with a corresponding pitch line. Lastly, the ribbon maybe cut off in any desired lengths from the long ribbon stock and holesdrilled at the opposite ends, so that it is then completed and ready forthe saw frame.

It will also be understood that the pitch of the wave line and teeth areslightl exaggerated in, the drawings for the sa e o clearness ofillustration.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent is p A saw for meat cutting comprising a narrowsteel band cut to the desired length, one edge of the band having a wavethereon of substantially three-quarters of an inch from crest to crestand havinga' depth from trough to crest of substantiallysiXteen-thousandths V of an inch (.016), the lower edge of the bandbeing toothed, the teeth being arranged also in a wave of the samelength and depth and the crests and troughs of eachwave of the toothededge properly corresponding with the crests and troughs in the waves ofthe upper edge of the saw, the number of the teeth being substantiallynine to twelve to the, inch, and the linear pitch of the wave remainingthe same independent of thenumber of the teeth. r

In testimony whereof I affix my signature.

ADOLPH O. SCHAEFER.

